Is it possible to set up Inventor 2014 so that a new project will already contain custom libraries?
We have several part libraries as well as material/appearance libraries, and I don't want the users to have to select and add each time the start a new project...
Not really. There is (so far as I know) no such thing as a template file for project files.
What we do instead is place a "template" project file in a server folder. Rather than actually creating new project files, we copy and rename the "template."